(b)  
Make sure the top, bottom, and corners of the seal are in the correct position.

 (c)  
Use strips of masking tape to temporarily attach the seal to the door frame.

 S 422-007
 (2)  
Install the seal into the seal retainer at each corner of the door for a distance of 1-2 inches.

 (a)  
Install the inboard edge of the seal into the inboard side of the seal retainer.

 CAUTION:_______BE CAREFULL WHEN YOU INSTALL THE SEAL. DO NOT MAKE CUTS, TEARS, OR HOLES IN THE SEAL. DAMAGE TO THE SEAL CAN EASILY OCCUR.

 (b)  
Use the door seal installation tool (or a smooth, rounded tool) to push the outboard edge of the seal into the outboard side of the seal retainer. Push the seal vertical to the seal edge to keep the seal smooth.

 NOTE: Use liquid soap to lubricate the seal during the
____
 installation.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 S 422-008
 (3)  
Install the seal into the seal retainer at the center of each side of the door.

 S 422-009

 (4)  
Install the remaining parts of the seal.

 S 422-025

 (5)  
Make the seal smooth. Remove the wrinkles and the waviness in the lip of the seal.

 S 412-012

 (6)  
Close and latch the door.

 S 212-013

 (7)  
Visually make sure the lip of the seal is smooth and flat against the skin at the edge of the door cutout.

 S 212-014

 (8)  
Make sure the edge of seal touches the seal depressor with the deflection shown (View A, Fig. 201).

 S 222-015

 (9)  
Do a visual check on the edge of the seal with the door in the open (free) position and the top and lower gates in the closed (faired) position.

 (a)  
Open the door.

 (b)  
Disconnect the gate pushrods at the top and lower gate connections.

 (c)  
Make sure the seal waviness (Fig. 201) is not too much. The permitted amplitude, A, is less than 0.55 inch or less than 10 percent of the wave length, B.

 TASK 52-09-02-792-017
 4.  Air Leak and Seal Contact Surface Inspection (Fig. 201)____________________________________________
 A. General
 (1)  Use this task to check the air leak between the pressure seal on the entry door and the seal depressor on the body structure.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400
MAINTENANCE MANUAL

 (2)  
You can check the seal contact surface of the pressure seal to the seal depressor with a powder colored chalk.

 B.
Consumable Materials

 (1)  
Power Color Chalk

 (2)  
A00001 EC 3587 Compound - Fairing

 C.
Access

 (1)  
Location Zones
 831L No. 1 Main Entry Door (Left)
 835L No. 5 Main Entry Door (Left)

 D.
Procedure

 S 212-018
 (1)  
Do a check for nicotine stains, crack or porosity on the pressure seal.

 (a)  
Open the door.

 (b)  
Examine for nicotine stains, cracks or porosity on the pressure seal.

 S 212-019
 (2)  
If you do not see nicotine stains, cracks or porosity on the pressure seal, do these steps:

 (a)  
Remove the lining and the dado panel around the door.

 (b)  
Examine the seal with the door closed.

 (c)  
Make sure the seal deflection is as shown in Detail A.

 S 212-020
 (3)  
Check the air leak with a flashlight.

 (a)  
With the lining and the dado panel around the door removed, direct a flashlight around the door opening from the outer airplane.
　
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